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Oscilloscopes: 2 TYPES , ANALOG,DIGITIAL SEE APPENDIX i

Oscilloscopes: 2 TYPES , ANALOG,DIGITIAL SEE APPENDIX i. ANALOG: DIRECTLY APPLIES THE VOLTAGE BEING MEASURED TO AN ELECTRON BEAM WHICH MOVES UP, DOWN AND ACROSS THE CRT SCREEN. DIGITIAL: SAMPLES INPUT WAVEFORM AND

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Oscilloscopes: 2 TYPES , ANALOG,DIGITIAL SEE APPENDIX i

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  1. Oscilloscopes: 2 TYPES, ANALOG,DIGITIAL SEE APPENDIX i ANALOG:DIRECTLY APPLIES THE VOLTAGE BEING MEASURED TO AN ELECTRON BEAM WHICH MOVES UP, DOWN AND ACROSS THE CRT SCREEN. DIGITIAL: SAMPLES INPUT WAVEFORM AND USES A TO D CONVERTER TO CHANGE VOTLAGE INTO DIGITAL INFORMATION. DIGITAL OSCOPES HAVE MOSTLY REPLACED ANALOG SCOPES. SMALLER,LIGHT WEIGHT 4 CHANNEL MULTIPLE MENU.

  2. LIGHTWEIGT DIGTIAL LCD OSCOPE, GREAT FOR TROUBLESHOOTING IN CRAMPED SPACES

  3. Old school analog Illustration showing the interior of a cathode-ray tube for use in an oscilloscope. Numbers in The picture indicate: 1.Deflection voltage electrodes 2.Electron gun 3.Electron beam 4.Focusing coil 5.Phosphor-coated inner side of the screen MAKE presents: The Oscilloscope http://www.youtube.com/watch?v=SxZWcku_Sw0

  4. CYCLE P.203: ONE WAVEFORM THAT DOES NOT REPEAT ITSELF ½ CYCLE .25 S PERIOD (T) : TIME TO COMPLETE ONE CYCLE.( IN THIS CASE .25 SECONDS)

  5. SAME THING

  6. FREQUENCY( f ) : # OF CYCLES/SECOND Time (sec) FORTHIS WAVEFORM f = 1 CYCLES/SEC HERTZ: UNIT OF FREQUENCY . FOR THE ABOVE WAVEFORM f = 1 Hz f =1/T OR f =1/λ AMPLITUDE: (a) HEIGTH OF THE WAVEFORM.

  7. EXAMPLE: FIND THE FREQUENCY FOR THE WAVE FORM BELOW. =1/T = 1/20ms = 1/.002 = 500Hz

  8. ANALOG SCOPES MAKE 2 BASIC MEASUREMENTS, AMPLITUDE AND TIME.

  9. TYPICAL WAVEFORMS THAT CAN BE SEEN ON AN OSCOPE

  10. TRIGGERING: USES THE SAME TRIGGER POINT ON A CONTINUOUS WAVE FORM TO CREATE A STABLE DISPLAY. http://www.youtube.com/watch?v=qIfo_-d82Co You tube: Oscilloscope Tutorial Part 1 - Choosing an oscilloscope

  11. TYPES OF PROBES TIMES ONE PROBE( X1) (SHIELDED WIRE) TIMES TEN PROBE (X10) (LOW CAPACITANCE PROBE)

  12. YOU TUBE: Oscilloscope Tutorial Part 2 - Basic usage http://www.youtube.com/watch?v=hUIgAu3QQWQ

  13. FUNCTION GENERATOR

  14. BASIC MEASUREMENTS WITH OSCOPES VPP=# OF VERTICAL DIVISIONS x VOLT/DIVISION T (PW) = # OF HORIZONAL DIVISIONS x SECOND/DIVISION f = 1/T VRMS =VPP/2 X .707 NONSINUSOIDAL WAVE FORMS (PULSES) PW: PULSE WITDH PULSE WIDTH PULSE REPETITION TIME (prt) PULSE REPETITION FREQUENCY (prf) prt prf = 1/prt

  15. 2.0 FIND Vpp, T ,f OFTHE DISPLAYED WAVEFORM 1.5 3.4 1.0 SET SIG. GEN. TO SAWTOOTH F =1KHz AT 1.7 Vp AMPLITUDE .5 SCOPE SETTINGS X: SEC/DIV = 0.2 MS/DIV Y:VOLT/DIV = 0.5 V/DIV Y FROM SCOPE SCREEN COUNT VpK SHOULD BE 3.4 VERTICAL DIV X 0.5V/DIV VpK=1.7V VPP=2xVPK=2X1.7V=3.4V .8 .2 .4 .6 X T = 5 HORZ. DIV X 0.2MS/DIV = 1ms f = 1/T =1/1ms =1KHz YOU TUBE: Oscilloscope Tutorial Part 3 - Advanced functions http://www.youtube.com/watch?v=g_KuGEh0PyA

  16. 20 15 FROM SCOPE FIND PW, prt, Vpk SET SIG. GEN. TO SQUARE WAVE AMPLITUDE = 20V F = 125 KHz SCOPE SETTING X: SEC/DIV = 1us/DIV Y: V/DIV = 5V/DIV 10 5 PW = 4 HORZ. DIV X 1us/DIV = 4us prt = 9.6 HORZ. DIV X 1us/DIV = 8us 1 2 3 4 us YOU CAN CONFIRM THIS RESULT

  17. LISSAJOUS PATTERNS ARE MADE BY APPLYING TWO AC SIGNALS TO THE HORZ. AND VERT. INPUTS OF AN OSCOPE AT THE SAME TIME. SET THE TIME DIVISION SWITCH TO X/Y POSITION ON THE OSCOPE WITH THE TWO FUNCTION GENERATORS SET TO THE SAME FREQUENCY, A CIRCLE SHOULD APPEAR ON YOUR OSCOPE. WITH 1FUNCTION GENERATOR WITH 2 FUNCTION GENERATORS 1:1 http://www.youtube.com/watch?v=mLKPwWGBtIw YOU TUBE: Function Generator Tutorial

  18. Basics of Lissajous Patterns on an Oscilloscope http://www.youtube.com/watch?v=t6nGiBzGLD8 http://www.youtube.com/watch?v=U8bXpzppdR0 Oscilloscope for iPad, iPhone and iPod touch

  19. FREQUENCY RATIO

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